A tree planted in a Paris suburb in memory of a young Jewish man who was tortured to death in 2006 has been chopped down, authorities said Monday, confirming the latest in a series of anti-Semitic acts in France.

Ilan Halimi was kidnapped by a gang that demanded huge sums of money from his family, believing them to be rich because he was Jewish.

After being tortured for three weeks, the 23-year-old cellphone salesman was found dumped next to a railway in the southern suburb of Sainte-Genevieve-des-Bois. He died while being brought to hospital.

On Monday, municipal workers sent to prepare a memorial site for a annual remembrance ceremony this week discovered that a tree planted in his honour had been chopped down and a second one partly sawn through, local officials told AFP.

The police are investigating the incident, which the French government's special representative on racism, anti-Semitism and discrimination, Frederic Potier, described as "ignominious".

It is the latest in a series of anti-Semitic acts and attacks that have raised fears of a new wave of anti-Jewish violence in a country that is home to Europe's biggest Jewish population.

In two separate incidents in the past two days, swastikas were drawn on Paris postboxes containing portraits of late Holocaust survivor Simone Veil and the word Juden (German for Jews) was sprayed on the window of a bagel bakery in the capital.

The incident involving the postboxes was reported by artist Christian Guemy, who painted the portraits of Veil on the boxes in the city's 13th district to mark her burial last year at the Pantheon, final resting place of France's most illustrious figures.

A former justice minister, Veil was a hugely respected figure whose death in 2017 caused a national outpouring of emotion.

"Shame on the despicable person that disfigured my tribute to Simeon Veil, Holocaust survivor," Guemy tweeted Monday along with pictures of the boxes.